In case anyone is interested in this new handset, following is my quick review after using it for a day: I just received my WIP310 last night and, so far, my impression has been very positive. I've been walking around with it all day in the house and backyard, and it hasn't dropped a connection yet. There is very little jitter or noise as long as you use the "tighter" codecs (G.729 or GSM). Provisioning was easy too; in fact I just loaded the configuration XML from a Linksys SPA962 and then changed a few settings via the web interface. Of course, there are a couple of issues Cisco needs to address still: - Menu and feature navigation is a bit clumsy in places - Phonebook downloading doesn't work - VM waiting indicator is broken - Options to configure messaging appear to be missing - Settings menu is missing about 1/3 of the options it needs - Admin login doesn't work; you have to log in as user then switch to admin - Custom ringtones can be selected but there is no mechanism to get them on the phone - Documentation is COMPLETELY non-existent The plus side is that all these shortcomings are fixable in the firmware. Cisco has already released an update from what shipped on the phone, which is a good sign that they are working hard to finish it. The hardware, on the other hand, is quite solid and ready to go. FYI, I am using 3CX's PBX with a pretty vanilla (inside the firewall) SIP configuration. I've made calls to and from a Grandstream GXP2000, 3CX's softphone, the X-Lite softphone, and out through CallCentric's VoiP gateway. G.729 on the Grandstream and CallCentric sounds better than GSM on the softphones, but they're all "good enough" in my opinion. G.711 (PCMU/PCMA) was horrible though, with lots of clicking and stuttering.